Re: Message duplication in Sent folder after upgrade

4 Oct 2025

      Hi Nick,
the Double Post was "intenional" - I was not subscribed with this
emailadress so the first mail went into "moderator approval" and I
resent it after subscribing myself to the list....the mods were even
faster so it was doubled :)
Oliver
On 03.10.25 22:58, Nick Tait via dovecot wrote:
...
On 04/10/2025 00:49, Oliver Welter via dovecot wrote:

 Hi All,

 I have migrated my mailserver (from dovecot 2.2 on debian 10 to dovecot
 2.3 provided by the mailcow-dockerized project) by coping over the
 mailstorage directory "as is".

 There is now a single mailbox where I have an issue with duplicated mails
 - the "Sent" folder had approx 400 mails upon migration, it now has 4500
 mails with each mail duplicated several times. Below are the header lines
 of one message, besides the Message-Id the header is exactly the same on
 all copies.

 I tried "doveadm force-resync" on the mailbox and the mailbox was removed
 and recreated from scratch on the mail app but  we still get additional
 copies added  - anybody has an idea what is going on here and how to fix
 this?

 Oliver

Hi Oliver.

Just wanted to let you know that I received 2 copies of your email above.
They had different dates and message IDs, and the multipart boundary IDs
were different (which is probably due to the way mailman forwards the
message) and a few other minor things (also related to mailman?) but the
content was otherwise the same.

In case it helps the dates and message IDs were:
Message-ID: [1]<4f2d0415-a239-4af7-b636-09c47bc510b1@oliwel.de>
Date: Fri, 3 Oct 2025 13:21:30 +0200
and
Message-ID: [2]<f0f3e00c-ff56-435b-b861-c5c555d2c6ee@oliwel.de>
Date: Fri, 3 Oct 2025 13:49:55 +0200
It would be interesting to know what your mail logs show when you sent
your email?

Nick.
References
Visible links
1. mailto:4f2d0415-a239-4af7-b636-09c47bc510b1@oliwel.de
2. mailto:f0f3e00c-ff56-435b-b861-c5c555d2c6ee@oliwel.de

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